Question

the no of protons in the cation exceed the valency elctrons what does it means ???

Answer 1

if a neutral atom loses one or more electrons, it has a net positive charge and is known as a cation. If an atom gains electrons, it has a net negative charge and is known as an anion.

if hydrogen atom has 1 electron, 1 neutron and one proton. if it loses an electron.

it becomes H+ a hydrogen_ positively charged cation_ or just a hydrogen ion